Hi every one i have a website developed in zend framework and this website is developed by another developer my website shows but i checked in the source code there is no robots.how i can resolve this problem
Hello and welcome to our forums! 
Check the file for the layout, which can be found in a standard application structure in this file path: module/Application/view/layout/layout.phtml
Search for $this->headMeta('noindex, nofollow', 'robots') or $this->headMeta()->appendName('noindex', 'noindex, nofollow')
https://docs.laminas.dev/laminas-view/helpers/head-meta/#basic-usage